Prices, I don't know. All the foreigners I know in Al Khor live in 'The community', a large compound between Al Khor proper and Ras Lafan which has one school, and one social club etc. I had thought housing and club membership was provided by the various employers. It's about 40 minutes drive from the North end of Doha to al Khor.
Warning! I don't live there, though I have visited and have pals there.